Ergonomic walking cane



FIG. 1 is an isometric view of an ergonomic walking cane showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a rear view thereof.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an ergonomic walking cane, as shown and described. 